I've been using it for the past few days, it's just as fast as Opera for me, and much faster than Firefox 2.0. The only extension I rely on that doesn't work is the Tab browser preferences thing, but I can deal without that. As long as Adblock plus works, I'm good to go. I will say that if Opera could get something like Ad Block plus I'd use that as my main browser. And that block content thing they have doesn't count.
